Seattle Deputy Police Chief Nick Metz, center, is shown on the monitor of a television video camera as he speaks Tuesday at a news conference to announce a new gun buyback program that will begin later in January, 2013 in Seattle. Behind him, is former Seattle mayor Norm Rice, left, and Seattle Mayor Mike McGinn, right. (AP Photo/Ted S. Warren)

Photo: Associated Press

Seattle Deputy Police Chief Nick Metz, center, is shown on the...

Aaron Williams, left, pastor of Mount Zion Baptist Church, and Ty Rogers, center, corporate communications manager for Amazon.com, listen Tuesday, as former Seattle Mayor Charles Royer, right, speaks at a news conference to announce a new gun buyback program that will begin later in January, 2013, in Seattle. Amazon, a Seattle-based online retailer, is donating $30,000 in gift cards, which will be paid to people who turn in guns during the buyback program. (AP Photo/Ted S. Warren)

Seattle Mayor Mike McGinn, center, speaks Tuesday, at a news conference to announce a new gun buyback program that will begin later in January, 2013, in Seattle. Behind him, from left, are former Seattle mayors Charles Royer, and Norm Rice, King Co. Executive Dow Constantine, and Seattle Deputy Police Chief Nick Metz. (AP Photo/Ted S. Warren)

Photo: Associated Press

Seattle Mayor Mike McGinn, center, speaks Tuesday, at a news...

Seattle Mayor Mike McGinn, second from right, stands Tuesday at a news conference to announce a new gun buyback program that will begin later in January, 2013, in Seattle. At left are former Seattle mayors Charles Royer, left, and Norm Rice, second from left, and at right is King Co. Executive Dow Constantine. (AP Photo/Ted S. Warren)